I'm always going on about color temperature and swearing I'll explain it later, so here's a photo which illustrates everything:
Note how blue the outside looks. This is because tungsten sources (the interior lights) are much warmer (more orange) than daylight.
You don't usually see this color difference in movies because we match the lights inside and outside so everything looks even.
On a completely unrelated note: I saw Transamerica with a friend last night.
If Felicity Huffman doesn't win the Oscar (tm) for Best Actress, I will personally give a wedgie to the first Acadamy (tm) member I catch.